Custer Park weather by month
What a typical year looks like in Custer Park, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at KANKAKEE WWTP, 24 km from Custer Park; records cover 1887–2026.
The year at a glance
- Precipitation a year
- 41.7 in1058 mm
- Snow a year
- 21 in53 cm
- Last spring freeze
- Apr 18
- First fall freeze
- Oct 16
- Heating degree days
- 5,981
- Cooling degree days
- 998
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Custer Park in January
Highs average 33°0° and lows 16°−9°, with 2.4 in60 mm of precipitation and 8 in21 cm of snow in a typical January.
- Record high
- 66°19° (2008)
- Record low
- −29°−34° (1985)
- Heating degree days
- 1258
- Cooling degree days
- 0
Custer Park in February
Highs average 37°3° and lows 20°−7°, with 1.9 in49 mm of precipitation and 3 in9 cm of snow in a typical February.
- Record high
- 74°23° (2000)
- Record low
- −21°−29° (1979)
- Heating degree days
- 1029
- Cooling degree days
- 0
Custer Park in March
Highs average 49°9° and lows 29°−1°, with 2.5 in63 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 85°29° (2012)
- Record low
- −7°−22° (2002)
- Heating degree days
- 808
- Cooling degree days
- 2
Custer Park in April
Highs average 61°16° and lows 39°4°, with 3.9 in98 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 91°33° (1986)
- Record low
- 8°−13° (1982)
- Heating degree days
- 448
- Cooling degree days
- 7
Custer Park in May
Highs average 73°23° and lows 51°11°, with 5.2 in131 mm of precipitation in a typical May.
- Record high
- 99°37° (2018)
- Record low
- 0°−18° (1949)
- Heating degree days
- 172
- Cooling degree days
- 72
Custer Park in June
Highs average 82°28° and lows 61°16°, with 5.2 in132 mm of precipitation in a typical June.
- Record high
- 103°39° (1988)
- Record low
- 38°3° (2003)
- Heating degree days
- 22
- Cooling degree days
- 216
Custer Park in July
Highs average 85°29° and lows 65°18°, with 4.7 in118 mm of precipitation in a typical July.
- Record high
- 103°39° (1987)
- Record low
- 46°8° (2001)
- Heating degree days
- 2
- Cooling degree days
- 306
Custer Park in August
Highs average 83°28° and lows 63°17°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 107°42° (1988)
- Record low
- 39°4° (1986)
- Heating degree days
- 5
- Cooling degree days
- 256
Custer Park in September
Highs average 78°26° and lows 55°13°, with 3.6 in90 mm of precipitation in a typical September.
- Record high
- 99°37° (1990)
- Record low
- 30°−1° (1991)
- Heating degree days
- 76
- Cooling degree days
- 121
Custer Park in OctoberThis month
Highs average 65°18° and lows 43°6°, with 3.4 in86 mm of precipitation in a typical October.
- Record high
- 90°32° (2007)
- Record low
- 18°−8° (1981)
- Heating degree days
- 355
- Cooling degree days
- 18
Custer Park in November
Highs average 50°10° and lows 32°0°, with 2.8 in72 mm of precipitation and 0.6 in1.5 cm of snow in a typical November.
- Record high
- 79°26° (2016)
- Record low
- 1°−17° (1977)
- Heating degree days
- 720
- Cooling degree days
- 0
Custer Park in December
Highs average 38°3° and lows 22°−5°, with 2.4 in60 mm of precipitation and 5 in13 cm of snow in a typical December.
- Record high
- 71°22° (2012)
- Record low
- −26°−32° (1983)
- Heating degree days
- 1086
- Cooling degree days
- 0